Goldbachs Conjecture

There is a famous mathematical conjecture called the Goldbach conjecture, that every even integer greater than 2 has the property that it is the sum of two prime integers. Write a C program that will prove that this conjecture is true for even numbers between a START value and a FINISH value. For example, if START = 700 and FINISH = 800 the initial output of your program would be:

700 = 17 + 683
702 = 11 + 691

The values of START and FINISH are to be supplied by command line arguments.

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I have this but theres a problem with a loop somwhere cuz when run it just stays blank